Other cache owners have set challenges based upon squares of Ordnance Survey maps, here are some you may be interested in, some of which are also shown on the UK Map page
Coming Soon
- Outdoor Leisure 15 Challenge - Purbeck & South Dorset
- GC4P54M Welsh Geosquare Challenge
- Explorer 167 Thornbury, Dursley & Yate
- Explorer 168 Stroud, Tetbury & Malmesbury
- Explorer 179 Gloucester, Cheltenham & Stroud
- Outdoor Leisure 14 Challenge - Wye Valley & Forest of Dean